Three Angora goats of 2 years old and with permanent rumen cannula were used in tihe experiments. Feeding the animals were performed according to 3x3 Latin square desing with 30 day periods. The alfalfa straw and concentrate mixture were fed in the proportions of 80 :20, 60 :40 and 40 : 60 in treatments I, II and III respectively. The rations were given once a day at the 3 % level o'f each goat's body weight.

The ruminal samples were taken before feeding at 4 th and 8 tth hours after feeding in the remaining twelve days of each period. pH values of rumen content for all of 3 rations were found to be highest (7.iH5, 7.25, 7.125) before feeding, decreased (5.95, 6.17, 6,32) at the 4th hour and increased (6.03, 6,22, 6.46) at the 8 th hour after feeding.

While the pH values of rumen contents were decreasing acetic acid, propionic acid, butyric acid and total volatile fatty acid increased at 4 th hour after feeding.

The difference between the acetic acid values of treatment II and III was found significant (p < 0.05) at 4 and 8 th hours after feeding. Whereas the difference between butyric acid values of treatment II and III was found highly significant (p < 0.01) at all sampling times. All values of volatile fatty acids were higher for treatment III than the other treatments at the each sampling time.